I've been using Spitfires for several seasons with great success. I have to disagree with Paul L Mohr a little bit though. I would recommend a minimum of 65 ft. lbs of energy for using them.

For example, Paul said he was shooting a 400 grain arrow 230 fps. That's only 47 ft. lbs of energy which IMO is far too low to shoot expandable heads.

I am one of the staunchest advocates of expandable broadheads as long as their appliacation is correct in term of the set up. It is the hunter's responsibility to make sure he/she has the energy to effectively use them and to know their limitations on taking angled shots.

OK, enough thread hijacking. Bottom line, Spitfires are one of the best broadheads out there. Quality components and well made.